Stage 11: account linking & merge (email + Telegram Login Widget) (#12)

gateway/internal/transcode/transcode.go

@@ -63,10 +63,13 @@ type Registry struct {
 	ops map[string]Op
 }
 
-// TelegramValidator validates Mini App launch data via the connector side-service.
-// *connector.Client implements it; a nil value disables the telegram auth path.
+// TelegramValidator validates Telegram credentials via the connector side-service:
+// Mini App launch data (auth) and Login Widget data (linking, Stage 11).
+// *connector.Client implements it; a nil value disables the telegram auth and
+// telegram-link paths.
 type TelegramValidator interface {
 	ValidateInitData(ctx context.Context, initData string) (connector.User, error)
+	ValidateLoginWidget(ctx context.Context, data string) (connector.User, error)
 }
 
 // NewRegistry builds the slice's message-type catalog over the backend client.
@@ -98,6 +101,7 @@ func NewRegistry(backend *backendclient.Client, tg TelegramValidator) *Registry
 	r.ops[MsgChatList] = Op{Handler: chatListHandler(backend), Auth: true}
 	r.ops[MsgChatNudge] = Op{Handler: nudgeHandler(backend), Auth: true}
 	registerStage8(r, backend)
+	registerStage11(r, backend, tg)
 	return r
 }
 
@@ -118,6 +122,9 @@ func DomainCode(err error) (string, bool) {
 	if errors.Is(err, connector.ErrInvalidInitData) {
 		return "invalid_init_data", true
 	}
+	if errors.Is(err, connector.ErrInvalidLoginWidget) {
+		return "invalid_login_widget", true
+	}
 	return "", false
 }